![background image](http://html1.mh-extra.com/html/kramer/vp-553xl/vp-553xl_user-manual_2002231056.webp)
VP-553xl –
The VP-553xl RS-232 Communication Protocol
51
CR
= Carriage return (ASCII 13 = 0x0D)
LF
= Line feed (ASCII 10 = 0x0A)
SP
= Space (ASCII 32 = 0x20)
9.1.3
Command Terms
Command
A sequence of ASCII letters ('A'-'Z', 'a'-'z' and '-').
Command and parameters must be separated by at least one space.
Parameters
A sequence of alphameric ASCII characters ('0'-'9','A'-'Z','a'-'z' and some special
characters for specific commands). Parameters are separated by commas.
Message string
Every command entered as part of a message string begins with a
message
starting character
and ends with a
message closing character
.
Note
: A string can contain more than one command. Commands are separated by
a pipe ( '|' ) character.
Message starting character
'#' – For host command/query
'~' – For machine response
Device address
(Optional, for K-NET)
K-NET Device ID followed by '@'
Query sign
'?' follows some commands to define a query request.
Message closing character
CR – For host messages; carriage return (ASCII 13)
CRLF – For machine messages; carriage return (ASCII 13) + line-feed (ASCII 10)
Command chain separator character
When a message string contains more than one command, a pipe ( '|' ) character
separates each command.
Spaces between parameters or command terms are ignored.